Flow Sensor
4-2 Rev 2/01
4.3 PROCESS CONNECTIONS
Piping from the meter run must be connected to the Flow Sensor of the EF-Series flow computer.
Both the static and differential pressures are piped to female ¼-18 NPT connections on the bottom of
the Sensor. The EF-Series Unit is an upstream device, meaning that the static pressure line normally
must be connected to the high pressure side (labeled “H” on the sensor body).
If you need to use the EF-Series Unit as a downstream device:
1.
Connect the “H” side of the sensor to downstream pressure, so that flow in relation to the
sensor is reversed from its normal direction.
2.
Use ROCLINK to configure the meter run for Downstream operation (this automatically
adjusts the static pressure by adding in the differential pressure).
3.
Calibrate the differential pressure as described in Section 4.6.
4.4 SENSOR WIRING
The EF-Series Unit and its Flow Sensor are shipped from the factory with the wiring connected
between them. This wiring consists solely of a ribbon cable from the Sensor, which is plugged into the
P/DP connector on the Main Electronics Board at P11. This ribbon cable is keyed to fit into the P11
connector in only one direction.
CAUTION
Always turn power off to the flow computer before you connect or disconnect wiring.
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